Research results are presented from a study examining the competitive sorption effects of two organic chemicals, para-dichlorobenzene and 2,4-dichlorophenol, to solids from the Cohansey aquifer in the New Jersey coastal plain. It was found that the sorption of p-DCB onto solids previously sorbed with 2,4-DCP did not induce desorption of the 2,4-DCP while the sorption equilibrium characteristics of the p-DCB were not significantly different than that obtained for single solute systems. It was concluded that different sites may be involved in the sorption processes.